/*
 * Copyright (C) 2013 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package sunsun.xiaoli.jiarebang.utils.bluetooth_utils;

import android.app.Activity;
import android.app.Service;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothGatt;
import android.bluetooth.BluetoothGattCallback;
import android.bluetooth.BluetoothGattCharacteristic;
import android.bluetooth.BluetoothGattDescriptor;
import android.bluetooth.BluetoothGattService;
import android.bluetooth.BluetoothManager;
import android.bluetooth.BluetoothProfile;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Binder;
import android.os.IBinder;
import android.util.Log;

import java.util.List;

import com.itboye.pondteam.utils.LogUtils;

import static sunsun.xiaoli.jiarebang.utils.bluetooth_utils.DecodeStringHexUtil.byte2HexStr;
import static sunsun.xiaoli.jiarebang.utils.bluetooth_utils.byteHe.buildByte;

/**
 * Service for managing connection and data communication with a GATT server hosted on a
 * given Bluetooth LE device.
 */
public class BluetoothLeService extends Service {
    public final static String TAG = "bluetooth_tag";

    private BluetoothManager mBluetoothManager;
    private BluetoothAdapter mBluetoothAdapter;
    private String mBluetoothDeviceAddress;
    private BluetoothGatt mBluetoothGatt;
    //ble characteristic
    private BluetoothGattCharacteristic mNotifyCharacteristic;
    private BluetoothGattCharacteristic mWriteCharacteristic;

    private int mConnectionState = STATE_DISCONNECTED;

    private static final int STATE_DISCONNECTED = 0;
    private static final int STATE_CONNECTING = 1;
    private static final int STATE_CONNECTED = 2;

    public static String ACTION_GATT_CONNECTED =
            "com.example.bluetooth.le.ACTION_GATT_CONNECTED";
    public static String ACTION_GATT_DISCONNECTED =
            "com.example.bluetooth.le.ACTION_GATT_DISCONNECTED";
    public static String ACTION_GATT_SERVICES_DISCOVERED =
            "com.example.bluetooth.le.ACTION_GATT_SERVICES_DISCOVERED";
    public static String ACTION_DATA_AVAILABLE =
            "com.example.bluetooth.le.ACTION_DATA_AVAILABLE";
    public static String EXTRA_DATA =
            "com.example.bluetooth.le.EXTRA_DATA";
    public static String ACTION_WRITE_SUCCESSFUL =
            "com.example.bluetooth.le.WRITE_SUCCESSFUL";
    public static String ACTION_GATT_SERVICES_NO_DISCOVERED =
            "com.example.bluetooth.le.GATT_SERVICES_NO_DISCOVERED";
    public static String ACTION_GATT_SERVICES_NO_DISCOVERED_2 =
            "android.bluetooth.gatt.profile.action.REGITION_APP";
//    public final static UUID UUID_BLE_SPP_NOTIFY = UUID.fromString(BleSppGattAttributes.BLE_SPP_Notify_Characteristic);

    // Implements callback methods for GATT events that the app cares about.  For example,
    // connection change and services discovered.
    private final BluetoothGattCallback mGattCallback = new BluetoothGattCallback() {
        @Override
        public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) {
            String intentAction;
            if (newState == BluetoothProfile.STATE_CONNECTED) {
                intentAction = ACTION_GATT_CONNECTED;
                mConnectionState = STATE_CONNECTED;
                broadcastUpdate(intentAction);
                LogUtils.v(TAG, "Connected to GATT server.");
                // Attempts to discover services after successful connection.
                LogUtils.v(TAG, "Attempting to start service discovery:" +
                        mBluetoothGatt.discoverServices());

            } else if (newState == BluetoothProfile.STATE_DISCONNECTED) {
                intentAction = ACTION_GATT_DISCONNECTED;
                mConnectionState = STATE_DISCONNECTED;
                LogUtils.v(TAG, "Disconnected from GATT server.");
                broadcastUpdate(intentAction);
            }
        }

        @Override
        public void onServicesDiscovered(BluetoothGatt gatt, int status) {
            if (status == BluetoothGatt.GATT_SUCCESS) {
                BluetoothGattService service = getSupportedGattServices().get(1);

                if (service != null) {
//                    LogUtils.v(TAG, "onServicesDiscovered service");
//                    //找到服务，继续查找特征值
                    mNotifyCharacteristic = service.getCharacteristics().get(0);//.getCharacteristic(UUID.fromString(BleSppGattAttributes.BLE_SPP_Notify_Characteristic));
                    mWriteCharacteristic = service.getCharacteristics().get(1);//.getCharacteristic(UUID.fromString(BleSppGattAttributes.BLE_SPP_Notify_Characteristic));

//                    LogUtils.v(TAG,mNotifyCharacteristic.getUuid().toString()+"  notify");
//                    LogUtils.v(TAG,mWriteCharacteristic.getUuid().toString()+"  write");
                }
                if (mNotifyCharacteristic != null) {
//                    LogUtils.v(TAG, "onServicesDiscovered mNotifyCharacteristic");
                    broadcastUpdate(ACTION_GATT_SERVICES_DISCOVERED);
                    //使能Notify
                    setCharacteristicNotification(mNotifyCharacteristic, true);
                }
                if (service == null) {
//                    LogUtils.v(TAG, "service is null");
                    broadcastUpdate(ACTION_GATT_SERVICES_NO_DISCOVERED);
                    mBluetoothGatt.discoverServices();
                }

            } else {
                LogUtils.v(TAG, "onServicesDiscovered received: " + status);
            }
        }


        @Override
        public void onCharacteristicRead(BluetoothGatt gatt,
                                         BluetoothGattCharacteristic characteristic,
                                         int status) {
            if (status == BluetoothGatt.GATT_SUCCESS) {
                broadcastUpdate(ACTION_DATA_AVAILABLE, characteristic);
            }
        }

        @Override
        public void onCharacteristicChanged(BluetoothGatt gatt,
                                            BluetoothGattCharacteristic characteristic) {
//            LogUtils.v(BluetoothLeService.TAG, "onCharacteristicChanged");
            broadcastUpdate(ACTION_DATA_AVAILABLE, characteristic);
        }

        //Will call this when write successful
        @Override
        public void onCharacteristicWrite(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status) {
//            LogUtils.v(BluetoothLeService.TAG, "onCharacteristicWrite");
            if (status == BluetoothGatt.GATT_SUCCESS) {
//                LogUtils.v(BluetoothLeService.TAG, "onCharacteristicWrite  BluetoothGatt.GATT_SUCCESS");
                broadcastUpdate(ACTION_WRITE_SUCCESSFUL, characteristic);
            }
        }
    };

    private void displayAllServiceAndCharacteristics() {
        List<BluetoothGattService> supportedGattServices = getSupportedGattServices();
        for (int i = 0; i < supportedGattServices.size(); i++) {
            BluetoothGattService supportedGattService = supportedGattServices.get(i);
            List<BluetoothGattCharacteristic> characteristics = supportedGattService.getCharacteristics();
            LogUtils.v(TAG, "parentIndex:" + i + "   parentUUID=" + supportedGattService.getUuid().toString());
            for (int i1 = 0; i1 < characteristics.size(); i1++) {
                BluetoothGattCharacteristic characteristic = characteristics.get(i1);
                LogUtils.v(TAG, "parentIndex:" + i + " childIndex:" + i1 + "   UUID=" + characteristic.getUuid().toString());
            }
        }
    }

    private String address = "";

    private void broadcastUpdate(final String action) {
        final Intent intent = new Intent(action);
        sendBroadcast(intent);
    }

    byte[] buffer = new byte[18];
    int length = 0;

    private void broadcastUpdate(final String action,
                                 final BluetoothGattCharacteristic characteristic) {
        final Intent intent = new Intent(action);
        byte[] data = characteristic.getValue();
//        if (data != null) {
//            if (data.length > 0 && data.length < 18 && length < buffer.length) {
//                LogUtils.v(TAG, "   --------------------------------------------------<<<<<");
//                System.arraycopy(data, 0, buffer, length, data.length);
////                LogUtils.v(TAG, byte2HexStr(data));
//                for (byte datum : data) {
//                    LogUtils.v(TAG, byteToHex(datum) + "   <<<<<");
//                }
//                LogUtils.v(TAG, "   --------------------------------------------------<<<<<");
//                if (length >= 18) {
//                    data = buffer;
////                    for (byte datum : buffer) {
////                        LogUtils.v(TAG, byteToHex(datum) + "   <<<<<数据片段");
////                    }
//                } else {
//                    length += data.length;
//                    return;
//                }
//            } else {
//
//            }
//        }
        if (ACTION_DATA_AVAILABLE.equals(action)) {
            String hexData = byte2HexStr(data);
            LogUtils.v(BluetoothLeService.TAG, "responseData  hexData:" + hexData);
        }
        if (data != null && data.length > 0) {
            //处理得到到的数据
            /**
             * 2.1 数据包结构
             *      字节序号	    名称	        内容
             *       0	        起始标志	    0xAA
             *       1	        消息类型	    数据包类型
             *       2 - 16	    数据内容	    数据内容，共15字节，数据内容不足15字节的字节填充0x00
             *       17	和校验	校验值       为字节0 ~字节16的累加值 //
             */
            if (data[0] != (byte) 0xAA) {
//                return;
            }
            intent.putExtra(EXTRA_DATA, data);
        }
//        }

        sendBroadcast(intent);
    }

    public class LocalBinder extends Binder {
        public BluetoothLeService getService() {
            return BluetoothLeService.this;
        }
    }

    @Override
    public IBinder onBind(Intent intent) {
        return mBinder;
    }

    @Override
    public boolean onUnbind(Intent intent) {
        // After using a given device, you should make sure that BluetoothGatt.close() is called
        // such that resources are cleaned up properly.  In this particular example, close() is
        // invoked when the UI is disconnected from the Service.
        close();
        return super.onUnbind(intent);
    }

    private final IBinder mBinder = new LocalBinder();

    /**
     * Initializes a reference to the local Bluetooth adapter.
     *
     * @return Return true if the initialization is successful.
     */
    public boolean initialize() {
        // For API level 18 and above, get a reference to BluetoothSearchAdapter through
        // BluetoothManager.
//        if (mBluetoothManager == null) {
            mBluetoothManager = (BluetoothManager) getSystemService(Context.BLUETOOTH_SERVICE);
            if (mBluetoothManager == null) {
                Log.e(TAG, "Unable to initialize BluetoothManager.");
                return false;
            }
//        }

        mBluetoothAdapter = mBluetoothManager.getAdapter();
        if (mBluetoothAdapter == null) {
            Log.e(TAG, "Unable to obtain a BluetoothSearchAdapter.");
            return false;
        }

        return true;
    }

    /**
     * Connects to the GATT server hosted on the Bluetooth LE device.
     *
     * @param address The device address of the destination device.
     * @return Return true if the connection is initiated successfully. The connection result
     * is reported asynchronously through the
     * {@code BluetoothGattCallback#onConnectionStateChange(android.bluetooth.BluetoothGatt, int, int)}
     * callback.
     */
    public boolean connect(final String address) {
        this.address = address;
        if (mBluetoothAdapter == null || address == null) {
            LogUtils.v(TAG, "BluetoothSearchAdapter not initialized or unspecified address.");
            return false;
        }

        // Previously connected device.  Try to reconnect.
        if (mBluetoothDeviceAddress != null && address.equals(mBluetoothDeviceAddress)
                && mBluetoothGatt != null) {
            LogUtils.v(TAG, "Trying to use an existing mBluetoothGatt for connection.");
            if (mBluetoothGatt.connect()) {
                mConnectionState = STATE_CONNECTING;
                return true;
            } else {
                return false;
            }
        }

        final BluetoothDevice device = mBluetoothAdapter.getRemoteDevice(address);
        if (device == null) {
            LogUtils.v(TAG, "Device not found.  Unable to connect.");
            return false;
        }
        // We want to directly connect to the device, so we are setting the autoConnect
        // parameter to false.
        mBluetoothGatt = device.connectGatt(this, false, mGattCallback);
        LogUtils.v(TAG, "Trying to create a new connection.");
        mBluetoothDeviceAddress = address;
        mConnectionState = STATE_CONNECTING;
        return true;
    }

    /**
     * Disconnects an existing connection or cancel a pending connection. The disconnection result
     * is reported asynchronously through the
     * {@code BluetoothGattCallback#onConnectionStateChange(android.bluetooth.BluetoothGatt, int, int)}
     * callback.
     */
    public void disconnect() {
        if (mBluetoothAdapter == null || mBluetoothGatt == null) {
            Log.w(TAG, "BluetoothSearchAdapter not initialized");
            return;
        }
        mBluetoothGatt.disconnect();
    }

    /**
     * After using a given BLE device, the app must call this method to ensure resources are
     * released properly.
     */
    public void close() {
        if (mBluetoothGatt == null) {
            return;
        }
        mBluetoothGatt.close();
        mBluetoothGatt = null;
    }

    /**
     * Request a read on a given {@code BluetoothGattCharacteristic}. The read result is reported
     * asynchronously through the {@code BluetoothGattCallback#onCharacteristicRead(android.bluetooth.BluetoothGatt, android.bluetooth.BluetoothGattCharacteristic, int)}
     * callback.
     *
     * @param characteristic The characteristic to read from.
     */
    public void readCharacteristic(BluetoothGattCharacteristic characteristic) {
        if (mBluetoothAdapter == null || mBluetoothGatt == null) {
            Log.w(TAG, "BluetoothSearchAdapter not initialized");
            return;
        }
        mBluetoothGatt.readCharacteristic(characteristic);
    }

    /**
     * Enables or disables notification on a give characteristic.
     *
     * @param characteristic Characteristic to act on.
     * @param enabled        If true, enable notification.  False otherwise.
     */
    public void setCharacteristicNotification(BluetoothGattCharacteristic characteristic,
                                              boolean enabled) {
        if (mBluetoothAdapter == null || mBluetoothGatt == null) {
            Log.w(TAG, "BluetoothSearchAdapter not initialized");
            return;
        }
        boolean setValue = mBluetoothGatt.setCharacteristicNotification(characteristic, enabled);

        // This is specific to BLE SPP Notify.
//        if (UUID_BLE_SPP_NOTIFY.equals(characteristic.getUuid())) {
//            BluetoothGattDescriptor descriptor = characteristic.getDescriptor(
//                    UUID.fromString(BleSppGattAttributes.CLIENT_CHARACTERISTIC_CONFIG));
//            descriptor.setValue(BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE);
        LogUtils.v(TAG, "setCharacteristicNotification:" + setValue);
//            mBluetoothGatt.writeDescriptor(descriptor);

        for (BluetoothGattDescriptor dp : characteristic.getDescriptors()) {
            dp.setValue(BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE);
            mBluetoothGatt.writeDescriptor(dp);
        }

//        }
    }


    public void writeData(byte[] data) {
        if (mWriteCharacteristic != null &&
                data != null && mBluetoothGatt != null) {
//            LogUtils.v(TAG, "WRITE DATA SUCCESS");
            mWriteCharacteristic.setValue(data);
            //mBluetoothLeService.writeC
            mBluetoothGatt.writeCharacteristic(mWriteCharacteristic);
        }

    }

    public void writeToService(byte... dataToWrite) {
        if (mWriteCharacteristic != null &&
                dataToWrite != null && mBluetoothGatt != null) {
            byte[] buildData = buildByte(dataToWrite);
            mWriteCharacteristic.setValue(buildData);
            //mBluetoothLeService.writeC
            mBluetoothGatt.writeCharacteristic(mWriteCharacteristic);
        }
    }

    public IntentFilter makeGattUpdateIntentFilter(Activity activity) {
        final IntentFilter intentFilter = new IntentFilter();
        ACTION_GATT_CONNECTED =
                "com.example.bluetooth.le.ACTION_GATT_CONNECTED";
        ACTION_GATT_DISCONNECTED =
                "com.example.bluetooth.le.ACTION_GATT_DISCONNECTED";
        ACTION_GATT_SERVICES_DISCOVERED =
                "com.example.bluetooth.le.ACTION_GATT_SERVICES_DISCOVERED";
        ACTION_DATA_AVAILABLE =
                "com.example.bluetooth.le.ACTION_DATA_AVAILABLE";
        EXTRA_DATA =
                "com.example.bluetooth.le.EXTRA_DATA";
        ACTION_WRITE_SUCCESSFUL =
                "com.example.bluetooth.le.WRITE_SUCCESSFUL";
        ACTION_GATT_SERVICES_NO_DISCOVERED =
                "com.example.bluetooth.le.GATT_SERVICES_NO_DISCOVERED";
        ACTION_GATT_SERVICES_NO_DISCOVERED_2 =
                "com.example.bluetooth.le.GATT_SERVICES_NO_DISCOVERED";
        BluetoothLeService.ACTION_GATT_CONNECTED = activity.getComponentName().getClassName() + "_" + BluetoothLeService.ACTION_GATT_CONNECTED;
        BluetoothLeService.ACTION_GATT_DISCONNECTED = activity.getComponentName().getClassName() + "_" + BluetoothLeService.ACTION_GATT_DISCONNECTED;
        BluetoothLeService.ACTION_GATT_SERVICES_DISCOVERED = activity.getComponentName().getClassName() + "_" + BluetoothLeService.ACTION_GATT_SERVICES_DISCOVERED;
        BluetoothLeService.ACTION_DATA_AVAILABLE = activity.getComponentName().getClassName() + "_" + BluetoothLeService.ACTION_DATA_AVAILABLE;
        BluetoothLeService.ACTION_WRITE_SUCCESSFUL = activity.getComponentName().getClassName() + "_" + BluetoothLeService.ACTION_WRITE_SUCCESSFUL;
        BluetoothLeService.ACTION_GATT_SERVICES_NO_DISCOVERED = activity.getComponentName().getClassName() + "_" + BluetoothLeService.ACTION_GATT_SERVICES_NO_DISCOVERED;
        intentFilter.addAction(BluetoothLeService.ACTION_GATT_CONNECTED);
        intentFilter.addAction(BluetoothLeService.ACTION_GATT_DISCONNECTED);
        intentFilter.addAction(BluetoothLeService.ACTION_GATT_SERVICES_DISCOVERED);
        intentFilter.addAction(BluetoothLeService.ACTION_DATA_AVAILABLE);
        intentFilter.addAction(BluetoothLeService.ACTION_WRITE_SUCCESSFUL);
        intentFilter.addAction(BluetoothLeService.ACTION_GATT_SERVICES_NO_DISCOVERED);
        intentFilter.addAction(BluetoothLeService.ACTION_GATT_SERVICES_NO_DISCOVERED_2);
        return intentFilter;
    }

    /**
     * Retrieves a list of supported GATT services on the connected device. This should be
     * invoked only after {@code BluetoothGatt#discoverServices()} completes successfully.
     *
     * @return A {@code List} of supported services.
     */
    public List<BluetoothGattService> getSupportedGattServices() {
        if (mBluetoothGatt == null) return null;

        return mBluetoothGatt.getServices();
    }
}
